Fire-damper meaning

A passive fire protection product used in heating, ventilation, and air conditioning ducts.
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A damper which closes off an air duct automatically in the event of fire so as to restrict the passage of fire and smoke.
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(historical, archaic, mining) A mine worker who detects and clears a mine shaft of firedamp by intentionally burning or blowing it up.

Jack is a former fire damper who is injured in an explosion.

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